All the drivers tweeter, midrange and woofer are new and dramatically improved. So shannon, with poseidon boards you can mod mkiis and drive them with different tubes. Uses the same 12ax7 and kt886550 tubes as the infamous svt but is only 60100w vs 300w for the svt. This design coupled with the robust and high quality output transformers in. Page 1 cae dynaco driver replacement module pc1u rev 2. The venerable dynaco stereo 70 by dan schmalle from valve issue 3, march 1994 said to be the most popular tube amplifier ever made, the dynaco stereo 70 has been around for over thirtyfive years. Unfollow dynaco mk iii to stop getting updates on your ebay feed. The dynaco mark iii is the highest power amplifier that was widely sold under the dyna name. This new driver uses the classic modified mullard topology with constant current source in the tail of the phase splitter a perfect mix of performance and. The dynaco dynakit mark iv amplifier uses a circuit derrived from the dynakits mark ii and mark iii amplifier kits which became world famous at the time for superior quality while essentially simple and trouble free.
Dynaco dynakit mkiii manual power amplifier kit hifi. Well, i have bought just about every mod board available and have even done a few. Pair of dynaco mark iii monoblocks for sale sold but i. As your mkiii warms up, you will see the voltage come up. They have new 6sn7 driver boards with individual bias, a new multisection can cap, new 3d printed binding post plates and bias test points. Discussion in audio hardware started by dennis0675, aug 17, 2017. Diytube mark iii poseidon driver board triode electronics. Im not aware of people going to mk 3s then ditching them for something else they usually. Hi, the dynaco mk iv is designed to use a 7199, gz34 rectifier tube and a pair of el34 tubes.
Building the pc board pc1u components are to be inserted on the non foil side and soldered on the foil side. This board is a must for any serious restoration of the dynaco stereo70 to full stock condition. Our patented pushpull technology with limited wearing parts requires little maintenance. Dynaco mark iii restoration and modification hudson. Dynaco mark iv amplifier audiogon discussion forum. There was a nigher power amp the mark vi, but it wasnt widely available.
Once teh 7199 or the 7247 driver boards aer replaced, they really are no longer a true dunaco amp, but are upgrades, or ven totally new designs, with newer, better circuitry and passive components. Your dynakit mark ii is a complete 50 watt power amplifier kit which offers the highest possible fidelity, at low cost and in a compact arrangement. Here is a beautiful pair of dynaco mkiii mono amplifiers. Our newest version includes a filament jumper allowing use of tubes with 9aj or 9lp pinout, thus allowing use of. Dynaco mark iii poseidon board vs original dynaco 6ana driver board duration.
Dynaco mark iii poseidon board vs original dynaco 6ana. Dynaco mk iii type custom made very nice price reduced. This entry was written by admin, posted on march 18, 2010 at 8. Rio is a 50 ohm, sw resistor, used rather than the choke shown on the hookup diagram notes for sunn amplifiers. Diytube mark iii poseidon driver board driver board designed by shannon parks over at. The mk iiis can sound pretty good particularly after updating. Dynaco mkiii mono amplifiers completely restored and. Dynaco dynakit mark iv amplifier schematic and manual. I ordered the boards and components as a kit and sourced the coupling capacitors from mouser. The 6an8 input and driver tube still has the dynaco label on it. The dynaco m2 basic high performance door has a rapid openclose cycle that enables easy movement of products, equipment and people. Last few pics show updated caps on the driver boards, and high voltage multi section. Unfollow dynaco mk iv to stop getting updates on your ebay feed. Dynaco mk3 standard upgrade assembly, installation, and adjustment manual page 3 cae dynaco driver replacement module pc1u rev 2 iii.
I am looking for input on the dynaco mk iii monoblocks. Kiwame carbon film resistors are chosen for their warm and natural sound compared to modern metal film. Classic valve design assumes no responsibility for circuit or user damage from the use or misuse of these boards or any other. Dynaco dynakit mark iii tube amplifier schematic and manual. Also, remember that the mk iiis as in all the other dynaco stuff was designed when the.
I own a pair and occasionally run them to keep em alive. The original dynaco 6an8 design we believe was inferior to the 7199 driver used in the stereo 70. Dynaco mark iii poseidon board vs original dynaco 6ana driver. The tubes are all new, and the power tubes are brand new genelex kt88 gold lion tubes. These have been completely updated with new quad cap power supply filtering. Dynaco mark iii restoration and modification hudson valley hifi. The dynaco dynakit mark iii is a monoblock amplifier with a 6an8 input stage and a pushpull kt88 output stage. Dynaco mkiii mods diy canuck audio mart hifi and audio. Driver boards for dynaco mark ii and mark iii triode electronics.
Topologically it is really very similar to the amp board above, but with some provision for power supply atop the driver board. This elegant dyna mk iii upgrade was performed recently. Stereo 70 driver board 7199 board replacement modules a. Aside from the changes detailed above, the new panordynaco amp is clearly a stereo 70 clone. Anyone use a dynaco mkiii monoblock tube amp for bass.
Top view along with its very clean cage resting to the right. The 7199 tube is used as a pentode high gain voltage amplifier directly coupled to a cathode phase inverter. It feels more like a 20 or 30 wpc amplifier, and my old dynaco stereo 70. Ii was sold for several years until its replacement in. This is my attempt to document the differences between the original dynaco design of the mark iii amplifier using the 6an8 vs a new design diytube poseidon driver board using a 12ax7 and 12au7 or. Its early popularity was due to a reasonable price coupled with good quality iron and a. Both the mk ii and mk iii used the same power supply. Dynaco vintage amplifiers and tube amps for sale ebay.
New 6sn7 octal driver use for dyna mk3, vta m125s or vta m70s the bare. The dyna mkiii has a basic design flaw that none of the other dynaco products have. Classic equipment such as these dynas command very high prices in asia due primarily to their classic status and collectabilty. The scan below is the dynaco dynakit mark iii tube amplifier schematic from the instructions manual. A pair of custom dynaco mk iii monoblock amplifiers. With your circuit, one of the first things i noticed was that different recordings are clearly different, indicating to me that the amplifier is neutral, rather than colored. Dyna mark iii amp and the sds labs quad cap board wife warming her toes on the mkiiis. All connections to the board are marked with the original number markings on the top and bottom silkscreen layers. Thats when these things were laid out with black tape type material by the way. Put a set of nos tung sol 6550s gray plate no holes or black plates, nice driver tubes like a 6an8 and a mullardhammond gs 34 or 37 even better. It follows the original wire hole layout, but it was modified to use widely available 6gh8 6gh8a 6kd8 ecf82 tubes instead of the obsolete and hard to find 7199 tubes. The driver tubes were also relatively new zenith labeled uncarbonized 7199s, of unknown american manufacture. Also, is it possible to use other tubes with the original desgin. This is my attempt to document the differences between the original dynaco design of the mark iii amplifier using the 6an8 vs a new design.
The dynaco st70 surely must represent the greatest amplification. These have been serviced with new multi section and electrolytic caps, new solen silver metalized foil caps on the driver boards, new bias resistors and potentiometers. The irons are still good as are the original driver boards. Our update kit for the dynaco stereo 120 lets you rescue your dynaco from demise in the dumpster and make it better than new. This driver board came with great quality components, as well as great instructions on how to assemble the kit.
Restoration module this is an exact replacement for the original dynaco pc3 board fabricated from milspec materials. Therefore applying the same circuit that we developed for the stereo 70 to the mark 3 resulted in a dramatic improvement over the stock amplifier topology. It uses a circuit of outstanding performance characteristics, along with top quality parts, including the new dynaco a430 output transformer the finest available. The basic modification consists of replacing the driver board, performing easily done minor modifications revising a few connections to the output tubes, and installing to the power supply, your choice of input and output connectors. Forty years of technological progress allows us to bring you lower distortion and greater efficiency, along with protection circuits that make your amp nearly bulletproof.
My dynaco mkiiis are the dynakitparts version and i use the high gain tubes4hifi driver boards which use three 12at7s. Same exact size, parts layout, and hookup connections as the boards above. Dynaco mk iiis they have very strong test 6550 or kt88 ge output tubes. By using a cnc woodcutting machine on glued mdf boards, the exterior waves are. I am happy with the product quality and the performance of the vta driver boards. The basic modification consists of replacing the driver board, performing easily done minor modifications revising a few connections to the output tubes, and installing to the power.
Modifications for the dynaco tm mkiii mono power amplifier basic features. Get the best deals on dynaco vintage electronics when you shop the largest online selection at. This dynaco st70 driver board pc3 has been developed and designed to be a dropin replacement for dynaco 7199 board. Yes, they are no longer true dynaco amplifiers because the. The capacitors in the power supply are not rated at a high enough voltage for the power. Dynaco dynakit mk iii amplifiers, serviced for sale us. Recently we had an original owner pair of dynaco mark iii amplifiers brought. Get the best deals on dynaco vintage amplifiers and tube amps when you shop the largest online selection at. This dynaco mk iii sports a specially designed driver board produced in the 1980s at musical concepts. Dynaco mark iii mk 3 restoration part 9 final bg081 duration. Modifications for the dynaco tm mkiii mono power amplifier. The owner of the amps wanted them restored and modified with a new driver board which will accept different driver tubes.